Arc lamp



Nov. 29, 1927. 1,650,881

-. A. c. ROEBUCK ARC LAMP Filed April 1922 4 Sheets-Sheet l I u 7 h A H fq/uah @floebugk Nov. 29, 1927. 1,650,881

A. c. ROEBUCK ARC LAMP Filed p i 1 1922 4 Sheets-Sheet 2 5/0)? Q A 0 ebLLo/l;

Nov. 29, 1927. v 1,650,881

A. C. ROEBUCK ARC LAMP Filed April 17, 1922 4 Sheets-Sheet 3 Nov. 29, 1927. 1,650,831

. A. C. ROEBUCK ARC LAMP Filed April 17. 1922 4 Sheets-Sheet 4 Patented Nov. 29, 1927.

UNITED STATES PA'rEur ALVAH C. ROEBUCK, OF GHEGAGO, ILLINOIS, ASSIGNOR '10 THE EJETTERPRISE 'OE'TIGEE-L MANUFACTURING COMPANY, OF CHICAGO, ILLENOIS, A CQRIPORATION O15 ZLLINOIQ.

ARC LAMP.

Application filed April 17, 1922. Serial No. 554,282.

My invention relates to are lamps particularly adapted for use in picture pro ecting machines and has for one of its objects the provision of a simple and efficient construction for effecting control and operation of the light.

A further object is the arrangement of the different parts so as to prevent overheating of the moving parts in use.

A further object is the provision of simple and eiiicient means for effecting various adjustments of the parts.

A still further object is the provision of simple and efficient. means for striking an arc.

Other objects will appear hereinafter.

An embodiment of my invention is illustrated in the accompanying drawings forming a part of this specification and in which- Fig. 1 is an elevation of the right-hand side of a lamp ei'i'ibodying my invention;

Fig. 2 is a similar view of the left-hand side of the same; and

Figs. 3, i, 5, 6 and 7 are detail sections taken on lines 33, 4%, 5 5, 6--6 and 77, respectively, of Fig. 1.

Referring more particularly to the drawings, I have indicateda base 10 which may 30 be mounted in any approved manner, such as on rods 11. A rod 12 may be threaded in the base and provided with a hand wheel 13 for adjusting the base 10 in the usual manner for moving a lamp of this character forwardly and rearwardly in a lamp house, the latter not being shown.

The base 10 has an upwardly extending boss 1 1- to which is attached an upright tube 15. Disposed within the tube 15 is a post 16, preferably having serrations to provide minimum contacting surfaces and therefore less resistance in operation from rust, carbon ash, etc. On the sides of tube 15 are indicated two ears 17 and 18. Threaded in the ear 1? is a shaft 19 and the latter is slidably mounted in the ear 18. The shaft 19 has a peripheral notch 20 in its upper end and engaging a head 21 on the post 16 so that rotation of the. shaft 19 will move the post 16 vertically in tube 15.

Splined on the shaft 19 is a spiral gear22 which meshes with a spiral gear 23 on a shaft 241, the gear being held against upward movement by a sleeve 24 and the latter is provided with a hand wheel 25 for rotation thereof. The shaft 24L may have one or more universal joints 26 in it as desired. The arrangement of these parts is such that rotation of hand wheel 25 in one direction will lower post 16 in the tube 15 and rotation in the other direction will raise said post 16 in said tube.

On the upper end of post 16 is a head 27 which has arms 28 reaching upwardly and forwardly of the device. Also, there is an arm 29 on part 28 intermediate the forwardly projecting ends of said part 28. The parts 28 and 29 may be formed integrally with head 27 or in any other desirable manner.

A. screw 30 is journaled in the forward ends of members 28 and 29 providing bearings for the ends and central portion of the shaft. lVhen desired, separate bearing members 31 may be provided in the ends of member 28, as clearly indicated in Fig. 2, with screws 32 holding the bearings in position. A shaft 33 has one end j-ournaled in the front end of member 29 and another portion journaled in a boss 34 on head 27. Disposed on the shaft in member 29 is a gear 35 which meshes with a similar gear on screw 30 so that rotation of shaft 33 causes rotation of the screw 30. The gears 35 may be of a spiral form or arranged in any other desirable style. [it the rear end of shaft 33 is a hand wheel 36 and the shaft 33 may be provided with a universal joint 37' when desired. At an intermediate part of the shaft is a pinion 38 which meshes with a gear on a shaft a0 and the latter is provided with a hand wheel 11 for operating said shaft. The arrangement of these parts is such that when it is desired to feed the can bons fast, such as returning them to their initial starting positions when making a new trim, or putting in new carbons, hand wheel etl is operated, which through the multiplying gears rotates the shaft 33 at fast speed, and when it is desired to feed the carbon slowly, hand wheel 36 is operated to rotate shaft 33. The shaft 10 may be provided with a restricted portion 42 with a screw or other member 43 engaging the restricted portion a2 so that said shaft can move longitudinally to disconnect gears 38 and 39 when so desired.

The head 27 has a depending pin 45% at one side, as clearly indicated in Fig. 1. The pin 4a engages a grooved wheel 415 on a shaft 16 and the latter is threaded in a boss 47 on tube 15. The shaft i6 has a hand wheel 18 for operation thereof. Said shaft may also have a universal. joint when so desired. The grooved wheel and pin 4.4 are so arranged that there is sullicient play to permit longitudinal movement of shaft 46 to rotate the post 16 in tube 15. This adjustment is particularly useful in moving the lamp sidewise to bring the are at the optical -Xi$ of the device.

A guide 50 is provided on the upright part of member 28 for holding the carbon holder mountings against rotation on the screw 30. A member 51 is threaded on screw 80 above the member 29 with a portion engaging the guide 50. The threaded arrangement of member on screw 30 may be of any desirable construction. I have indicated a pin 52 extending through a portion of member 51 with its inner end. engaging the threads of screw 30 so as to provide tureaded relation between member 51 and scr The pin 52 may be held by a screw when so desired. At the forward end of member 51 is a block 54: held to the member 51 by screws 55, or their equivalent. Proper insulating material 56 is provided between members 51 and 54; and screws to electrically insulate the member Fri from its mounting. A carbon-holding clamp 57 is attached to the block 54; by screws 53, or their equivalent. The carbon holder 5'? may be of any approved construction, that illustrated being similar to the construction of my co-pending application Serial No. stance, filed April 17, 1922. The carbon holder 57 has an arm 59 to which an electrical conductor 60 is connected for conducting current to a carbon in carbon holder 5".

On the lower portion of the screw 30 is a blocl: 61. The threaded connection between block 61 and screw 30 may be similar to that described with relation to block 51. The member 61 has a guide portion 62 which engages a guide 50 on member 48. 2:. member 63 is slidably and rotatably mounted on the screw 30 with a portion above and a portion below the member 61. ii shaft is threaded in a boss 65 of member (31 and provided with. a grooved wheel 66 which engages a depending pin 67 on member as so that rotation of shaft 6% causes longitudinal movement of the latter and the grooved wheel (36 pressing on pin 67 causes rotation of the member 63 on screw 30. This move-- ment is provided for lateral movement of the lower carbon holder to aline the lower carbon sidewise with the upper carbon.

The member 68 is held by gravity with its upper portion resting on member (it and can be moved longitudinally upwardly, on the screw for moving the lower carbon holder up toward the upper carbon holder for striking an are. This relative upward movement of member 63 may be provided by a pin 68 mounted in a disc 69 on a shaft TO. The pin 68 engages a slot in the lower part of member 63, as clearly indicated in Fig. 1, so that a partial rotation of shaft 70 raises member (33, thus giving movement of the latter to bring the lower carbon toward the upper carbon to strike an arc. lvhen the carbons have been brought together, the shaft '70 can be rotated in the opposite direction or let loose and permit gravity to move the member (33 back against member 61 to separate the carbons after the arc is formed. The shaft 70 is provided with a hand wheel 72 and one or more universal joints 73 to facilitate its operation. The slot 71 has sutiicient length to permit the rotation of 1ne1nber 63 on screw 30.

The member 62} has three lugs therein. I

have parallel opei'iings n be two upper lugs '74 is mounted a shaft 75 having a hand wheel 76 and a universal joint 7'7. A member TS has lugs 79 and SO thereon with the lugs 79 threaded on the forward end of shaft 75. The shaft 75 has a groove therein in an ear T L with a screw 81 extending into the groove so as to prevent relative longitudinal movement of the shaft 7 and member (33 and cause longitudinal movement of member 7 with respect to shaft The member 78 has a pin 82 mounted in its lower portion-and the latter is slidahly mounted in one of the ears 74: so that the shaft Y5 and pin 8:2 provide mountings for member '78. The member 78 has mounted thereon a block 83 which is insulated from member by an insulation 84: which may he of any approved construction. Screws may connect the members 78 and 83. A carbon holder 86 similar to the carbon holder :37 is attached to the block 83 by screws ST, or their equivalent. The carbon holder 86 may have an electrical conductor arm 88 attached thereto to be connected to the electrical. current supplying means. The movable mounting of member 78 permits the lower carbon to be moved forwardly and rearwardly with respect to the upper carbon to draw the are to the front of the upper or positive carbon to bring it more nearly within the field of the axis of the device.

In use the two carbons are moved forwardly and rearwai.'dl together by operation of hand wheel 13 The carbons are moved upwardly and downwardly together by operating hand wheel The c rbons moved from side to side by operating hand wheel 48. The carbons are moved to-- ward and away from each other at slow speed by operating handle and move to ward and away from each other at a faster speed by operating handle 41. The lower carbon may be moved from side to side without movingthe upper carbon by operating handle The lower carbon is moved forwardly and rearwardly without moving the upper carbon by moving handle 76. ihe arc is struck by moving handle 72. It will thus beseen that these various movements may be accomplished without interfering with the position of other parts. The two carbons can be set from the outside of the lamp house at any desirable position and then the lower carbon can be moved from side to side and from frontwardly to rearwardly without interfering with the upper carbon. Also the lower carbon can be moved upwardly to strike an are quickly without losing the normal operating relation of the two carbons.

I claim 1. An arc lamp comprising a base having an upright tubular socket therein; a post mounted in said socket; a pin attached to said post and disposed substantially par allel with the latter; a shaft having threaded connection with said tubular socket; and a peripherally grooved wheel on said shaft engaging said pin.

2. An arc lamp comprising a base having an uprighttubular socket; a post mounted in said socket and having an enlargement thereon; a rod journaled on said tubular socket and having a peripheral notch en gaging said enlargement; a threaoed engagement between said rod and said tubular socket; and means for rotating said rod.

3. An are lamp comprising a base having an upright tubular socket; a post mounted in said socket and having an enlargement thereon; a rod journaled on said and having a peripheral notch engaging said enlargement; a threaded support from said rod on said tubular socket; a shaft rotatably mounted on said tubular socket; and gears connecting the shaft and rod for operating the latter upon rotation of said shaft.

l. An are lamp comprising a base; a pest mounted in said base; means for rotating said post in said base; means for moving said post vertically in said base; a head. on said post; arms on said head; a screw mounted in said arms; and carbon. holders mount ed on said screw.

5. An are lamp comprising a frame; two call-bon holders; means on the frame con necting said carbon holders together and adapted for moving the latter; a hand operable connection for moving the latter at slow speed and a second hand-operated means connected with said hand operable connection for operating the mounting of said carbon holders at a faster speed than the speed of said first-mentioned hand operable connection.

6. An are lamp comprising a frame; a shaft mounted in said frame; carbon holders; means connected with said shaft and carbon holders for moving the latter toward and away from eachother; a shaft substantially parallel with the first-mentioned shaft; separate hand-operating means for each of said shafts and multiplying gearing between the second-mentioned shaft and the first-mentioned shaft.

7. An are lamp comprising a. frame; a shaft journaled in said frame; a screw journaled in said frame; carbon holders mounted on said screw; an operable connection between said shaft and screw; a shaft spaced from the first-mentioned shaft; separate hand-operated mean-s for each of said shafts and multiplying gearing connecting said shafts for operating the first-mentioned shaft at a greater speed than the second-mentioned shaft.

8. An are lamp comprising a frame; carbon holders mounted in said frame for movement toward and away from each other; a shaft journaled in said frame and operatively connected with said carbon holders; a shaft journaled in said frame and having a peripheral groove therein; means in the frame engaging said groove for limiting longitudinal movement of the second-mentioned shaft; and meshing gears on said shafts the second-mentioned shaft being adapted for movement longitudinally permitting unmeshing and remcshing of said gears.

9. An arc lamp comprising a frame; carbon holders mounted in said. frame; and hand operable means comprising separate hand grips connected with said carbon hold ers for moving the latter toward and away from each other at different speecs for a given speed of hand operation.

10. An are lamp comprising a frame; a screw mounted in said frame; two blocks having thread-ed connection with and mount ed on said screw; a carbon holder attached to one of said blocks; a member slidably mounted on said screw and resting on the other block; means for moving said memher along the screw away from the adjacent block; and a carbon holder attached to the last-mentioned block.

11. An are lamp comprising a. frame; a screw mounted in the frame; two blocks mounted on said screw and having threaded connection with the latter; a member slidably and rotatably mounted on said screw and resting on the lower of said blocks; and means for raising said member relative to said lower block.

12. An arc lamp comprising a frame; a screw mounted in the frame; two blocks mounted on said screw and having threaded relation therewith; a member mounted on said screw and resting on the lower of said blocks, a pin on said member; and a shaft journaled in said block and having a portion engaging said pin for rotating said member on said screw.

Hill

13. An are lamp comprising a frame; a screw mounted in said frame; a block mounted on and having threaded connection with said screw; a member mounted on said screw and enga. said block; a shaft mounted in said member; a pin substantially parallel with said shaft and mounted in said member; a carbon holder mounting mounted on said shaft and pin, there being a threaded connection between said shaft and said carbon holder mounting; and a carbon holder on said carbon holder mounting.

14. An are lamp comprising a frame; a screw mounted in said frame; an upper carbon holder mounted on said screw; a lower carbon holder mounted on said screw; and means for rotat g said lower carbon holder about the axis or said screw; and means for moving the lower carbon holder both forwardly and rearwardly with respect to the lamp. r

15. An arc lamp comprising frame, an upper carbon holder 111011111180. in said frame, a lower carbon holder mounted in said frame, said carbon holders having substantially alined axes, means for moving said carbon holders toward and away from eac ther in the direction of their axes, and means for moving the lower carbon holder in the direction of the of the upper carbon holder and toward and away from the upper carbon holder while the latter remains stationary, said lower carbon holder being free to move by gravity away from said upper carbon holder when said moving means for said lower carbon is released.

16. An arc lamp comprising a frame, an upper carbon holder mounted in said frame, a block mounted in said frame, a lower carbon holder mounted on said block, said carbon holders having substantially alined carbon holding sockets, and means mounted on said block and attached to said lower carbon holder for moving the latter toward the up per carbon holder, said lower carbon holder being free to move by gravity away from said upper carbon holder when said moving means is released.

17. An are lamp comprising a frame; an upper carbon holder mounted in the frame; a block mounted in the lower part of said frame; a carbon holder mounting resting on said block and havin a recess therein; and a shaft journaled in said block and having an arm thereon engaging said recess.

18. An are lamp comprising a frame; a screw mounted in the frame; an upper carbon holder mounted on the screw; a block mounted on the screw below said upper carbon holder; a lower carbon holder mounted on the screw and resting on said block, there being a horizontal groove in said carbon holder; a shaft journaled in said block; a

crank pin mounted on the shaft and, engaging said groove; a pin on said carbon holder; and a rod threaded in said block and having a peripheral groove engaging said pin for rotating the carbon holder on said screw.

19. An arc lamp comprising a frame, a pair of carbon holders mounted on said frame, means for simultaneously adjusting said carbon holders toward and away from one another, means for adjusting one of said carbon holders laterally independently of the other of said carbon holders, means for adjusting one of said carbon holders forwardly and rearwardly relative to the other of said carbon holders, extension shafts for each of said adjusting means extending in substantially the same direction from said carbon holders, and hand-operated devices carried by said extension shafts at a dis- 'tance from said carbon holders.

20. An are lamp comprising a supporting frame, a pair of carbon holders mounted on said frame, separate means for imparting different adjustments to said carbon holders, extension shafts having flexible joints therein extending in the same general direction from said adjusting means, and hand-operated devices carried by said extension shafts a distance from said carbon holders.

21. An arc lamp comprising a pair of supporting arms, removable bearings mounted in said arms, a screw journalled in said bearings, and carbon holders mounted on said sorew.'

In testimony whereof I have signed my name to this specification on this 13th day of April, A. D. 1922.

ALVAH C. ROEBUGK. 

